？
I heard that if you don't pay your water bill, your water gets cut off — is that really true?
Literal
Water-bill [object-を] fall-behind-on [when-と] water-supply [object-を] be-stopped [called-という] thing [object-を] [humble-お]heard [but-が] true is [question-か]?
A polite verification question. お聞きしました is a kenjōgo (humble) form: the honorific お + 聞く's verb stem 聞き + しました. This is the humble construction お + [verb stem] + する/します, which lowers the speaker's own action to elevate the referent (the person who told them). ~ということを + [verb of learning] is the standard pattern for reporting received information: 'I heard [the fact that X].' 滞納する ('to fall behind on a payment, to default on') is a formal financial/legal verb — contrast with simpler 払わない ('not pay'). 給水を停止される is the passive of 給水を停止する ('to stop water supply'), news-register phrasing.